Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:33:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < arb2[nod].size(); ++ i){ ^ user.cpp:32:9: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int ok = 0; ^ user.cpp: In function ‘void solve(short int)’: user.cpp:56:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(short int i = 0; i < arb2[nod].size(); ++ i){ ^ user.cpp: In function ‘void dfs_heap(short int)’: user.cpp:78:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(short int i = 0; i < arb2[nod].size(); ++ i){ ^ user.cpp: In function ‘int main()’: user.cpp:89:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.in", "r", stdin); ^ user.cpp:90:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.out", "w", stdout); ^ user.cpp:92:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hd %hd", &n, &k); ^ user.cpp:94:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hd %hd", &x, &y); ^